Old lathe chucks, is the threaded part changeable?

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I have a 3 jaw and a 4 jaw. The 3 jaw fits my lathe spindle, but the other one doesn't. Looking at the back of them, I wonder if the threaded portion can be changed?


Also, what is this little thing for (that I'm pointing at with the screwdriver)? If I slide it one way, all the jaws move together, but the other way seems to allow them to move independently.

GlenHobart Champion 16Hobart Hefty CC/CVHobart Handler 140Lotos LTP5000D
Reply:Yes I use wight lifter weights.Dave

Originally Posted by ArcTan

I have a 3 jaw and a 4 jaw. The 3 jaw fits my lathe spindle, but the other one doesn't. Looking at the back of them, I wonder if the threaded portion can be changed?


Also, what is this little thing for (that I'm pointing at with the screwdriver)? If I slide it one way, all the jaws move together, but the other way seems to allow them to move independently.


Reply:Yes. What lathe do you have? Do you know what spindle thread is? If your lucky you could bore out the old back plate thread and cut new threads. In some cases you can find pre-made banks that only need to be turned to size fitted to the chuck.